Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-10-15
1994-11-15
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
181120, 251 63, H04R 2300, G01V 104
Patent
active
053654935
ABSTRACT:
The invention provides an air gun responsive to a supply of compressed gas, which facilitates rapid acceleration of a shuttle member to selectively actuate the air gun. The air gun includes a primary firing chamber which receives compressed gas in order to move the shuttle valve member to its full open position. The air gun also includes an initial acceleration chamber which provides an additional piston surface during the initial movement of the shuttle valve member so as to optimumly accelerate the valve member. This results in improved firing time repeatability.
REFERENCES:
patent: 4623033 (1986-11-01), Harrison, Jr.
patent: 4713800 (1987-12-01), Russell
patent: 4754443 (1988-06-01), Chelminski
patent: 5001679 (1991-03-01), Harrison
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